function like(btn, entityType, entityId,entityUserId) {
    $.post(
        CONTEXT_PATH + "/like",
        {
            "entityType":entityType,"entityId":entityId,"entityUserId":entityUserId
        },
            function(data) {
                data = $.parseJSON(data);
                if(data.code == 0) {
                    $(btn).children("i").text(data.likeCount);
                    $(btn).children("b").text(data.likeStatus==1?'已赞':"赞");
                } else {
                    alert(data.msg);
                }
        }
    );
}